01-01-2007, 11:01 PM
I found an easy way to get this achievement, after it took me forever to get it, because I didn't know what the game considered an "assault rifle". Just play the second mission (The Island) on Easy difficulty, and use the BAR for the entire level. If you run out of ammo, just smack people with the butt of your weapon, and you'll get the achievement. I really tried to conserve my ammo, and I finished the mission with like 150 rounds left, so you don't have to be a total tight-wad as far as using ammo.